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Quarterly Results of Operations | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations | QUARTERLY RESULTS OF OPERATIONS (UNAUDITED)
(In thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2018: |  |  |  |  |  |  |
Operating revenues | $ | 562,684 |  |  | $ | 619,130 |  |  | $ | 629,735 |  |  | $ | 646,365 |
Operating income | 35,115 |  |  | 50,783 |  |  | 63,386 |  |  | 74,931 |
Net income | 27,807 |  |  | 38,264 |  |  | 47,514 |  |  | 54,563 |
Basic earnings per share | 0.38 |  |  | 0.53 |  |  | 0.67 |  |  | 0.77 |
Diluted earnings per share | 0.38 |  |  | 0.53 |  |  | 0.66 |  |  | 0.77 |
(In thousands, except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
2017: |  |  |  |  |  |  |
Operating revenues | $ | 501,221 |  |  | $ | 519,508 |  |  | $ | 528,643 |  |  | $ | 567,365 |
Operating income | 25,972 |  |  | 36,913 |  |  | 35,874 |  |  | 45,061 |
Net income | 16,019 |  |  | 23,219 |  |  | 22,517 |  |  | 141,134 |
Basic earnings per share | 0.22 |  |  | 0.32 |  |  | 0.31 |  |  | 1.95 |
Diluted earnings per share | 0.22 |  |  | 0.32 |  |  | 0.31 |  |  | 1.94 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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